Composite armature-sleeve.



W. J. BAUROTH. COMPOSITE ARMATURE SLEEVE. APPLICATION FILED Aue.3|, 1911. RENEWED JUNE 3, I916.

Patented Jan. 80, 1917.

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COMPOSITE ARMATURE SLEEVE. APPLICATION FILED Aue.31.19n. RENEWED lu'mz 3,1916.

1 ,21 3,81 8. Patented Jan. 30, 1917.

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nnrrnn STATES PATENT oF-riou.

WALTER J. BAUBOTH, OF COLUMBUS, OHIO, ASSIG1 TOB TO THE JEFFREY MANUFAC- TUBING- COMPANY, A CORPORATION OF Oil-lift).

COMPOSITE ARMATURE-SLEEVE.

Application filed August 31, 1811, Serial No. 646,995. Renewed June 3, 1916.

To all whom. it may concern:

Be it known that I, WALTER J. BAUROTH, a citizen of the United States, residing at Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements 1n Composite Armature-Sleeves, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to improvements in armature structure and in particular for use in a motor when the reduction of space to a minimum is desirable.

When the cores of armatures were first built up of laminae of soft steel, they were assembled by stacking the disks upon the armature shaft and clamping them between nuts Or disks threaded upon the shaft. As it is often necessary to disassemble the armature this construction had the disadvantage that it was impossible to remove the shaft from thecore without entirely disassembling the core. The next step in the development of this type of armature was to assemble the disks upon a sleeve which was necessarily made of brass in order to prevent heating, due to the magnetization of the sleeve and shaft, as well as the prevention of eddy currents To further improve the operating conditions, the diameter of this brass sleeve was greatly increased with a consequent increase in the cost of production due to the hi h price of brass. An attempt to cheapen the construction resulted in the use of a small diameter steel sleeve and the punching of a series of oblong segmental holes in the disks, the spaces between which formed spokes of suliicient strength to support the armature and at the same time of such high magnetic resistance as to practically prevent the magnetization of the sleeve and shaft. This when the allowable length of the armature shaft admits of the placing of bearings outside of the armature. When, however, the motor is to be used in a very narrow space, as in a narrow gage locomotive, the bearings must either be shortened below the limits of satisfactory operation, or must extend well within the armature core. As this is not possible with a small steel sleeve construction, brass sleeves of comparatively large diameter recessed to accommodate the bearings are used.

Specification of Letters Patent.

arrangement is satisfactory- Patented Jan. 30, 1917.

Serial K0. 101,646.

The object of the present invention is the production of a sleeve of suiiiciently large diameter to admit of the inward projection of the bearings and of such construction that the internal parts will not be magnetized, together with the reduction of the amount of brass used in the structure. To accomplish this a cast iron spider is nioun ed upon the armature shaft and provided with a core supporting brass cylinder cast upon its outer portions. As the arms of the spider are not finished before it is placed in the mold for casting the brass upon it, there is no increase in the machine work over the older design, and, considering the wide difference in the values of brass and cast iron, the saving in cost is very considerable, especially in the larger sizes of armatures.

Referring to the drawings, Figure 1 is a partial longitudinal vertical sectional view through a motor in which the composite armature structure is used. Fig. 2 is a partial longitudinal vertical sectional View of the composite armature. Fig. 3 is an end elevation of the composite armature. Fig. lis an end elevation of a ring for clamping laminated disks on the composite armature. Fig. 5 is a vertical sectional view on the line ;-a of Fig. l. Fig. 6 is an end elevation of the laminated disk supporting cylinder; and Fig. 7 is a sec tional view on the line Z)b of Fig. 6.

In the drawings, the numeral 1 indicates an armature shaft passing through the walls 2 of a motor casing and supported in inward extended bearings 3. Field magnets l are formed in the motor casing and are surrounded by field coils 5. An armature spider 6 made of cast iron, or any other suitable magnetic material, is secured upon the shaft 1 and has cast upon the ends of its arms 7 a cylinder 8 made of brass, or any other suitable non-magnetic material. This non-magnetic cylinder 8 is interposed as a shield between the magnetic armature supporting spider 6 and the laminated core 9 assembled upon it. In order that the brass cylinder may be cast securely upon the ends of the arms of the core supporting spider, recesses 9 are formed in the ends of the of the spider within which the brass cylinder extends, thereby keying it securely against rotation upon the spider. To prevent any possible lateral motion of the cyl- 1 inder upon the spider the recesses 9 do not extend entirely across the ends of the spider a l-ms, thereby leaving projecting lugs 10, which key the cylinder against lateral motion.

in the above description it is evident that the cast iron core. supporting spider is placed in a mold, before being machined and then has the brass cylinder cast upon the ends of its arms. There is no necessity whatever for machining the spider and whatever machining is necessary is done after the brass cylinder is in place.

A core supporting drum 11 is placed upon the brass sleeve 8 at the end away from the end to the commutator 12 which is mounted upon a sleeve 13 extending from the spider (l. The core supporting drum is retained upon the cylinder 8 by means of a peripheral flange 1? formed on its end. The laminated disks of the core 9 are then stacked upon the cylinder 8 and clamped in place by means of a ring 14lslipped over the sleeve 13 and secured in place by means of keys 15. Since the drum 11 and the ring M are formed of magnetic material, two brass washers 16 are interposed between them and the laminated core 9, thus entirely shielding the core from contact with any magnetic metal.

d/ ith this structure it is possible to use a strong magnetic metal as a support for the core and extend the bearings of the armature shaft well within its ends, thereby materially shortening the overall dimensions of the motor.

netic core a support for the core, and a nonmagnetic metallic shield cast integral on said support and interposed between it and the core.

3. In an armature of the class described, the combination of a core, a support made of magnetic metal for said core and a nonmagnetic metallic shield cast integral upon the support and interposed between it and the core.

P at. In an armature oi the class described,

the combination e1? a core, a support for said core, said support provided with recesses at its outer extremities and a non-magnetic metallic shield cast integral upon the sup port extending into said recesses and interposed between the support and the core.

In testimony whereof I afliX my signature, in presence of two witnesses.

VVALTER J. BAURQTH. Witnesses:

DUDLEY T. Fi'snnu, W. liiecntr'r.

oi this patent may he obtained for live cents each, by addressing the Uoinraissioner of Patents,

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